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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: find-file-noselect needs save-match-data
Date: Sat, 09 Jun 2007 05:45:29 -0400
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Xref: news.gmane.org gmane.emacs.devel:72531
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    > This would violate referential transparency.  Consider
    >
    > (defvar foobar "foobar")
    >
    > (defun foo ()
    >   (string-match "foo" foobar)
    >   (match-string 0 foobar))
    >
    > (defun bar ()
    >   (string-match "bar" foobar)
    >   (preserve-match-data
    >    (foo)))

If referential transparency is something which dynamic variables
"violate", then it isn't relevant to Emacs.